I claim the ornamental design for a sport training device, as shown and described.

Description:

The present design relates to a device utilized by an avid sport person to assist a novice sport student in sports which require balance, by enabling the novice to be partially supported by the avid thus allowing gradually increased skill to the novice sport person.

FIG. 1 is a front elevation view of a sport training device constructed in accordance with my new design.

FIG. 2 is a side elevation view of the sport training device as viewed from view "A" of FIG. 1; and,

FIG. 3 is an end elevation view of the sport training device as viewed from view "B" of FIG. 1.